Federenko, Yuri F, Nikolai N Neofitov, Yuri N Yaroshenko, and Sergei K Denogratov. 2015. “Increased Muscle Potassium from Head down Tilt Sleeping of Healthy Subjects During Diminished Muscular Activity”. International Journal of Clinical and Experimental Physiology 2 (3), 157-64. https://ijcep.org/index.php/ijcep/article/view/88.